CN104819157B - A kind of self priming centrifugal pump - Google Patents
A kind of self priming centrifugal pump Download PDFInfo
- Publication number
- CN104819157B CN104819157B CN201510192101.8A CN201510192101A CN104819157B CN 104819157 B CN104819157 B CN 104819157B CN 201510192101 A CN201510192101 A CN 201510192101A CN 104819157 B CN104819157 B CN 104819157B
- Authority
- CN
- China
- Prior art keywords
- dividing plate
- impeller
- covering
- fan dividing
- spiral case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
- F04D9/02—Self-priming pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention relates to a kind of self priming centrifugal pump, including the pump housing, spiral case, preceding F shapes covering of the fan dividing plate and rear F shapes covering of the fan dividing plate, preceding F shapes covering of the fan dividing plate, F shapes covering of the fan dividing plate is formed in one with spiral case inwall afterwards, and front and rear F shapes covering of the fan dividing plate interlaced arrangement, it is 2 3mm that the blade of impeller, which protrudes front shroud of impeller and the distance of back shroud of impeller, this structure can not only be such that blade is fully contacted with liquid on the premise of larger hydraulic loss is not caused, disturbance when enhancing startup simultaneously in pump, be conducive to the rapid gas excluded in intake line and the pump housing, speed up gas and liquid is separated, shortened gas efflux time and upper water time, water speed in lifting.
Description
Technical field
The present invention relates to a kind of centrifugal pump, more particularly to it is a kind of be applied in self-priming centrifugal pump possess high efficient gas and liquid mixing
The pressurized water chamber structure of effect.
Background technology
Self priming pump belongs to special centrifugal pump, only needs to add a certain amount of water before first start into the pump housing, without that will intake
Pipe is full of water, gas in water inlet pipe can be arranged into light through certain time after starting, you can enter the pump of normal work.It utilizes gas-liquid
The special construction of mixing principle and pump realizes intake-gas, and forms in pump suction pipe road vacuum state to a certain degree, nothing
Other special air extractors need to be attached, except first using diversion is needed in addition to, later every time using just can no longer diversion.With using
Convenient, reliable operation is easy to long-distance centralized control, the advantages of carrying out automation mechanized operation, thus is widely used in ship, agricultural, city
The departments such as political affairs, electric power, mine, chemical industry, are especially suitable for flowing irrigation and drainage, mobile working, start the fields such as frequent and liquid filling difficulty
Close, there is the trend for progressively replacing Ordinary Centrifugal Pumps in the water lift of ground.
At present, two kinds of structure types of internal-mixing and exterior mixing, the structural factor of pump in itself are used domestic common self priming pump more
Influence the self-priming performance of pump.The index for evaluating self priming pump performance is mainly self-priming time and suction lift, and wherein self-priming time is
Pump is since the time required for continuous output liquid being continuously run starting to pump inlet, though foreign countries are related to self-priming mechanism
Research and new construction product, but due to patent protection and technology blockage, the open report in terms of academic research is less, and domestic
Self priming pump still suffers from self-priming time length, volume heaviness, the low deficiency of performance.
Therefore, the application proposes the pressurized water chamber structure in a kind of self-suction system for Self-priming pump, the structure is main
Applied in external-mix self-priming pump system, using integral forming, it is not necessary to any add-on device auxiliary, suction can be excluded rapidly
Gas in pipeline and the pump housing.
The content of the invention
In view of this, object of the present invention is to provide a kind of self priming centrifugal pump：Centrifuged in the prior art with overcoming
Pump efficiency of imbibition is low, the defect that gas-liquid separation effect is poor, upper water speed is slow.
In order to solve the above problems, technical scheme proposed by the present invention is as follows：The centrifugal pump includes the pump housing and spiral case, described
Spiral case is provided with spiral case delivery port 17, gas-liquid separation chamber's import 1 and return port 7 inside centrifugal pump body on spiral case；The centrifugation
Pump pump body is additionally provided with S-shaped bend pipe 12, and the S-shaped bend pipe 12 is connected with impeller inlet 10；The spiral case inner chamber constitutes self-priming
Impeller 3 is additionally provided with the volute chamber 6 of centrifugal pump, the volute chamber 6；The impeller 3 passes through front shroud of impeller 13 and back shroud of impeller 11
It is fixed on the pump shaft；The spiral case also includes preceding F shapes covering of the fan dividing plate 2 and rear F shapes covering of the fan dividing plate 5, the preceding F shapes covering of the fan every
Plate 2 is arranged on spiral case inwall with rear F shapes covering of the fan dividing plate 5；It is somebody's turn to do except the part of spiral case and S-shaped bend pipe 12 is constituted the pump housing inner chamber
The reservoir chamber 9 of centrifugal pump body；The lower end of the reservoir chamber 9 is provided with bowl formula return valve 8.
Further, the preceding F shapes covering of the fan dividing plate 2 and rear F shapes covering of the fan dividing plate 5 are in interlaced arrangement on spiral case inwall.
Further, the preceding F shapes covering of the fan dividing plate 2 and rear F shapes covering of the fan dividing plate 5 are identical structures, front and rear F shapes fan
Face dividing plate includes cuneiform/wedge shaped body 18, transverse arm I 19 and transverse arm II 20, and the transverse arm I 19 is arranged in parallel, institute with transverse arm II 20
It is sector to state the section of front and rear F shapes covering of the fan dividing plate.
Further, the quantity of the preceding F shapes covering of the fan dividing plate 2 and rear F shapes covering of the fan dividing plate 5 is respectively two；The preceding F shapes fan
Face dividing plate 2 is 20 ° with rear F shapes covering of the fan dividing plate 5 radian shared on the inner periphery of spiral case inwall.
Further, the preceding F shapes covering of the fan dividing plate 2, rear F shapes covering of the fan dividing plate 5 are formed in one with spiral case inwall.
Further, the impeller 3 is axially fixed in one end of pump shaft by nut, and impeller 3 is connected by key with pump shaft；
The blade protrusion front shroud of impeller 13 and back shroud of impeller 11 of impeller, protrusion distance is 2-3mm.
Further, the other end of the pump shaft is also equipped with bearing body 4, and the bearing body 4 is fixed by screws in pump
On body.
Further, the front shroud of impeller 13 is connected to impeller inlet end and positioned, and the back shroud of impeller 11 is supported
It is connected on pump shaft and is positioned.
Further, through hole is provided with the dividing plate of the pump body, the bowl formula return valve 8 is arranged in the through hole
In；Pump housing lower end has been bolted to connection return valve securing cover plate, and the bowl formula return valve 8 is solid by the securing cover plate
Dingan County is loaded on the pump housing.
Further, the bowl formula return valve 8 is made up of rubber, and can produce elastic deformation；Water in reservoir chamber can
Impeller outer edge and the further gas-liquid mixed of gas progress are back to by through hole and return port 7, when the hydraulic pressure in reservoir chamber
The deformation of bowl formula return valve is oppressed when reaching to a certain degree so as to block through hole, now the centrifugal pump completes self-priming process.
The advantage of the invention is that：（1）By preceding F shapes covering of the fan dividing plate and rear F shapes covering of the fan dividing plate interlaced arrangement, and make impeller
Blade protrudes 2 ~ 3mm of front shroud of impeller and back shroud of impeller, makes blade and liquid on the premise of larger hydraulic loss is not caused
Fully contacted, so that gas-liquid mixing capacity is greatly improved；（2）Preceding F shapes covering of the fan dividing plate is with rear F shapes covering of the fan dividing plate in snail
The specific setting of radian shared by the inner periphery of shell inwall causes the centrifugal pump, and not only noise is small, and is disturbed during enhancing startup in pump
It is dynamic, the upper water time of pump was shortened, speed up gas and liquid separation is easy to quickly complete self-priming process.
Brief description of the drawings
Fig. 1 is the structural representation of external-mix self-priming pump；
Fig. 2 is external-mix self-priming pump A to schematic cross-section；
Fig. 3 is the partial schematic diagram of preceding F shapes covering of the fan dividing plate；
Fig. 4 is the partial schematic diagram of front and rear F shape covering of the fan dividing plates；
Fig. 5 is the structural representation of front and rear F shape covering of the fan dividing plates.
In figure：Before the import of 1- gas-liquid separation chamber, 2- after F shapes covering of the fan dividing plate, 3- blades, 4- bearing bodies, 5- F shapes covering of the fan every
Plate, 6- volute chambers, 7- return ports, 8- bowls of formula return valves, 9- reservoir chambers, 10- impeller inlets, 11- blade back shrouds, 12- S-shapeds are curved
Pipe, 13- blade front shrouds, 14- pumping chambers, 15- gas-liquid separation chamber, 16- exhaust outlets, 17- delivery ports, 18- cuneiform/wedge shaped bodies, 19-
Transverse arm I, 20- transverse arms II.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described.
Refer to the attached drawing 1, the centrifugal pump includes the pump housing and spiral case, and the spiral case is provided with inside centrifugal pump body on spiral case
Spiral case delivery port 17, gas-liquid separation chamber's import 1, return port 7；S-shaped bend pipe 12, the S-shaped are additionally provided with inside the centrifugal pump body
Bend pipe 12 is connected with impeller inlet 10；The spiral case inner chamber constitutes in the volute chamber 6 of self-priming centrifugal pump, the volute chamber 6 and is additionally provided with leaf
Wheel 3；The impeller 3 is fixed on the pump shaft by front shroud of impeller 13 and back shroud of impeller 11；The spiral case also includes preceding F
Shape covering of the fan dividing plate 2 and rear F shapes covering of the fan dividing plate 5, the preceding F shapes covering of the fan dividing plate 2 are arranged on spiral case inwall with rear F shapes covering of the fan dividing plate 5
On；The pump housing inner chamber constitutes the reservoir chamber 9 of the centrifugal pump body except the part of spiral case and S-shaped bend pipe 12；Under the reservoir chamber 9
End is provided with bowl formula return valve 8.
The impeller 3 is axially fixed in one end of pump shaft by nut, and impeller 3 is connected by key with pump shaft；The leaf of impeller
Piece protrudes front shroud of impeller 13 and back shroud of impeller 11, and protrusion distance is 2 ~ 3mm.The other end of the pump shaft is also equipped with bearing
Body 4, the bearing body 4 is fixed by screws on the pump housing.The front end of front shroud of impeller 13 is connected to the progress of impeller inlet end
Positioning, the back shroud of impeller 11, which is connected on pump shaft, to be positioned.
With reference to Fig. 2-5, the preceding F shapes covering of the fan dividing plate 2 and rear F shapes covering of the fan dividing plate 5 are in interlaced arrangement on spiral case inwall；Institute
It is identical structure that preceding F shapes covering of the fan dividing plate 2, which is stated, with rear F shapes covering of the fan dividing plate 5, and front and rear F shapes covering of the fan dividing plate includes cuneiform/wedge shaped body
18th, transverse arm I 19 and transverse arm II 20, the transverse arm I 19 are arranged in parallel, the front and rear F shape covering of the fan dividing plates with transverse arm II 20
Section for sector；The quantity of the preceding F shapes covering of the fan dividing plate 2 and rear F shapes covering of the fan dividing plate 5 is respectively two；The preceding F shapes covering of the fan every
Plate 2 is 20 ° with rear F shapes covering of the fan dividing plate 5 radian shared on the inner periphery of spiral case inwall；The preceding F shapes covering of the fan dividing plate 2, rear F
Shape covering of the fan dividing plate 5 is formed in one with spiral case inwall.
With reference to Fig. 1, through hole is provided with the dividing plate of the pump body, the bowl formula return valve 8 is arranged in the through hole
In；Pump housing lower end has been bolted to connection return valve securing cover plate, the bowl formula return valve 8 by the securing cover plate with
The pump housing is fixedly mounted.The bowl formula return valve 8 is made up of rubber, and can produce elastic deformation；Water in reservoir chamber can
Impeller outer edge and the further gas-liquid mixed of gas progress are back to by through hole and return port 7, when the hydraulic pressure in reservoir chamber
The deformation of bowl formula return valve is oppressed when reaching to a certain degree so as to block through hole, now the centrifugal pump completes self-priming process.It is described
The lower end of the pump housing is provided with fixed mounting, and the fixed mounting is bolted the installation centrifugal pump.
The operation principle of the self-priming centrifugal pump of the present invention：Before initial start-up, water is filled in the pump housing.Impeller revolves at a high speed after startup
Turn, negative pressure is formed at impeller inlet 10 so that the air in water inlet pipe enters the pump housing.Prominent blade is fully connect with water
Touch, can efficient output gas-liquid mixed when prominent blade 3 turns over preceding F shapes covering of the fan dividing plate 2 and rear F shapes sallop screen 5 respectively
Thing.Water in pumping chamber 14 flows through gas-liquid separation chamber's import 1 and enters gas-liquid separation chamber 15, because the volume of gas-liquid separation chamber 15 is enough
Greatly so that flow velocity is reduced, gas-liquid separation is realized by the difference of liquids and gases proportion, gas then passes through the row of blast pipe 16
Go out, the water in gas-liquid mixture is back to reservoir chamber 9, impeller outlet be back to by return port 7, then with impeller inlet 10
Gas mixing, is discharged in gas-liquid separation chamber 15, so repeatedly, until draining the gas in suction line and the pump housing.Also, certainly
During suction, bowl formula return valve 8 is in opening in the presence of elastic force, and pump self-priming process is finished, and starts to run well
When, the pressure of reservoir chamber 9 is depressed higher than the pressure in volute chamber 6, bowl formula return valve 8, separates reservoir chamber 9 and volute chamber 6, thus
Eliminate leakage loss.Meanwhile, preceding F shapes covering of the fan dividing plate 2 and the rear interlaced arrangement of F shapes covering of the fan dividing plate 5, disturbing in pump when enhancing starts
It is dynamic, shorten water speed in gas efflux time and upper water time, lifting, and be conducive to gas-liquid separation.
To a kind of self priming centrifugal pump provided by the present invention and this is described in detail above, tool is applied herein
Body example is set forth to the principle and embodiment of the present invention, be noted that the foregoing is only it is of the invention compared with
Good embodiment, is not intended to limit the invention.It is any modification for being made within the spirit and principles of the invention, equivalent
Replace and improve etc., it should be included in the scope of the protection.
Claims (8)
1. a kind of self priming centrifugal pump, including the pump housing and spiral case, it is characterised in that the spiral case is inside centrifugal pump body, snail
Spiral case delivery port, gas-liquid separation chamber's import (1) and return port (7) are provided with shell；S-shaped bend pipe is additionally provided with inside the centrifugal pump body
(12), the S-shaped bend pipe (12) and impeller inlet (10) UNICOM；The spiral case inner chamber constitutes the volute chamber (6) of self-priming centrifugal pump, institute
State in volute chamber (6) and be additionally provided with impeller (3)；The impeller (3) is fixed on by front shroud of impeller (13) with back shroud of impeller (11)
On pump shaft；Front shroud of impeller (13) front end is connected to impeller inlet end and positioned, and the back shroud of impeller (11) abuts
Positioned on pump shaft；The other end of the pump shaft is also equipped with bearing body (4), and the bearing body (4) is fixed by screw
On the pump housing；
The spiral case also includes preceding F shapes covering of the fan dividing plate (2) and rear F shapes covering of the fan dividing plate (5), and the preceding F shapes covering of the fan dividing plate (2) is with after
F shape covering of the fan dividing plates (5) are arranged on spiral case inwall；The pump housing inner chamber except the part of spiral case and S-shaped bend pipe (12) is constituted should be from
The reservoir chamber (9) of heart pump body；The lower end of the reservoir chamber (9) is provided with bowl formula return valve (8).
2. self priming centrifugal pump according to claim 1, it is characterised in that the impeller (3) passes through nut axial restraint
In one end of pump shaft, impeller (3) is connected by key with pump shaft；The blade of impeller protrudes front shroud of impeller (13) and back shroud of impeller
(11), protrusion distance is 2~3mm.
3. self priming centrifugal pump according to claim 1, it is characterised in that the preceding F shapes covering of the fan dividing plate (2) and rear F shapes
Covering of the fan dividing plate (5) is in interlaced arrangement on spiral case inwall.
4. self priming centrifugal pump according to claim 1, it is characterised in that the preceding F shapes covering of the fan dividing plate (2) and rear F shapes
Covering of the fan dividing plate (5) is identical structure, and F shape covering of the fans dividing plate includes cuneiform/wedge shaped body (18), transverse arm I (19) and transverse arm II
(20), the transverse arm I (19) is arranged in parallel with transverse arm II (20), and the section of the F shapes covering of the fan dividing plate is sector.
5. self priming centrifugal pump according to claim 1, it is characterised in that the preceding F shapes covering of the fan dividing plate (2) and rear F shapes
The quantity of covering of the fan dividing plate (5) is respectively two；The preceding F shapes covering of the fan dividing plate (2) is with rear F shapes covering of the fan dividing plate (5) in spiral case inwall
Shared radian is 20 ° on inner periphery.
6. the self priming centrifugal pump according to any one of claim 3-5, it is characterised in that the preceding F shapes covering of the fan dividing plate
(2), rear F shapes covering of the fan dividing plate (5) is formed in one with spiral case inwall.
7. self priming centrifugal pump according to claim 1, it is characterised in that be provided with insertion on the dividing plate of the pump body
Hole, the bowl formula return valve (8) is arranged in the through hole；Pump housing lower end has been bolted to connection return valve and has fixed lid
Plate, the bowl formula return valve (8) is fixedly mounted by the securing cover plate and the pump housing.
8. self priming centrifugal pump according to claim 7, it is characterised in that the bowl formula return valve (8) is made up of rubber,
And elastic deformation can be produced；Water in reservoir chamber can be back to impeller outer edge with return port (7) by through hole and enter with gas
The further gas-liquid mixed of row, the deformation of bowl formula return valve is oppressed when the hydraulic pressure in reservoir chamber reaches to a certain degree and is passed through so as to close
Through hole, now centrifugal pump completion self-priming process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510192101.8A CN104819157B (en) | 2015-04-21 | 2015-04-21 | A kind of self priming centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510192101.8A CN104819157B (en) | 2015-04-21 | 2015-04-21 | A kind of self priming centrifugal pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104819157A CN104819157A (en) | 2015-08-05 |
| CN104819157B true CN104819157B (en) | 2017-09-26 |
Family
ID=53729580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510192101.8A Expired - Fee Related CN104819157B (en) | 2015-04-21 | 2015-04-21 | A kind of self priming centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104819157B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298857B (en) * | 2015-11-19 | 2017-12-05 | 江苏大学 | A kind of non-return valve of big-flow self-priming centrifugal pump self-suction system |
| CN106499638A (en) * | 2016-11-15 | 2017-03-15 | 江苏芬奇工业设备制造有限公司 | A kind of exterior mixing return port self-closing self priming pump |
| CN106762688A (en) * | 2016-11-15 | 2017-05-31 | 江苏芬奇工业设备制造有限公司 | A kind of self priming pump |
| CN110043469A (en) * | 2019-04-03 | 2019-07-23 | 江苏大学 | A kind of self-absorption centrifugal pump configuration carrying out interior flow field PIV measurement and PIV measurement method |
| CN118148933B (en) * | 2024-05-09 | 2024-07-09 | 烟台龙港泵业股份有限公司 | Self-priming centrifugal pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2178290Y (en) * | 1993-11-03 | 1994-09-28 | 仪群 | Non-plugging self-priming centrifugal impurity pump |
| CN2597713Y (en) * | 2002-08-22 | 2004-01-07 | 上海中开泵机制造有限公司 | Vertical self-priming pump |
| US6960061B2 (en) * | 2003-03-05 | 2005-11-01 | K.H. Brinkmann Gmbh & Co. Kg | Rotary pump with vented pump chamber |
| CN2744860Y (en) * | 2004-11-01 | 2005-12-07 | 义乌市第二石油化工泵厂 | Guide vane type self-suction centrifugal pump with strong gas-liquid separation function |
| CN1710284A (en) * | 2005-07-06 | 2005-12-21 | 江苏大学 | Self-priming jet automatic-closing circuit system for centrifugal pump |
| CN2799918Y (en) * | 2005-05-20 | 2006-07-26 | 长沙佳能制泵有限公司 | Sectional multistage self-priming pump |
| CN200949529Y (en) * | 2006-08-07 | 2007-09-19 | 柴建院 | Self priming pump |
| CN101063454A (en) * | 2006-04-28 | 2007-10-31 | 上海凯泉泵业（集团）有限公司 | Non leakage fully power closed type vertical self priming pump |
| CN204663902U (en) * | 2015-04-21 | 2015-09-23 | 江苏大学 | A kind of self priming centrifugal pump |
-
2015
- 2015-04-21 CN CN201510192101.8A patent/CN104819157B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2178290Y (en) * | 1993-11-03 | 1994-09-28 | 仪群 | Non-plugging self-priming centrifugal impurity pump |
| CN2597713Y (en) * | 2002-08-22 | 2004-01-07 | 上海中开泵机制造有限公司 | Vertical self-priming pump |
| US6960061B2 (en) * | 2003-03-05 | 2005-11-01 | K.H. Brinkmann Gmbh & Co. Kg | Rotary pump with vented pump chamber |
| CN2744860Y (en) * | 2004-11-01 | 2005-12-07 | 义乌市第二石油化工泵厂 | Guide vane type self-suction centrifugal pump with strong gas-liquid separation function |
| CN2799918Y (en) * | 2005-05-20 | 2006-07-26 | 长沙佳能制泵有限公司 | Sectional multistage self-priming pump |
| CN1710284A (en) * | 2005-07-06 | 2005-12-21 | 江苏大学 | Self-priming jet automatic-closing circuit system for centrifugal pump |
| CN101063454A (en) * | 2006-04-28 | 2007-10-31 | 上海凯泉泵业（集团）有限公司 | Non leakage fully power closed type vertical self priming pump |
| CN200949529Y (en) * | 2006-08-07 | 2007-09-19 | 柴建院 | Self priming pump |
| CN204663902U (en) * | 2015-04-21 | 2015-09-23 | 江苏大学 | A kind of self priming centrifugal pump |
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| Publication number | Publication date |
|---|---|
| CN104819157A (en) | 2015-08-05 |
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Inventor after: Shi Weidong Inventor after: Chang Hao Inventor after: Liu Jianrui Inventor after: Wu Yongsheng Inventor after: Li Xiaowei Inventor after: Liu Bowen Inventor before: Liu Jianrui Inventor before: Chang Hao Inventor before: Wu Yongsheng Inventor before: Li Xiaowei Inventor before: Liu Bowen |
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